Modernise The System Your Business Depends On
Old platforms keep running until the day they cannot be patched, staffed or audited. We replace them piece by piece, with the old system still in service while the new one is proven.
Legacy Systems Are A Governance Risk
A legacy system is often treated as a technical problem for the engineering team. In practice it is a risk the whole business carries. If the system fails, the questions come from customers, auditors and the board, not only from developers.
The risk grows quietly. The people who understand the system move on. Documentation falls behind the code. Each change takes longer because nobody is sure what else it will affect.
Treating modernisation as a governance matter means naming an owner, recording the known risks, and agreeing a plan that reduces them in order of importance.
Three Drivers That Make It Urgent
Support end dates
Vendors stop issuing fixes for old versions of languages, frameworks, databases and operating systems. After that point, every new defect is yours to work around.
Security exposure
Unsupported components do not receive security patches. Known weaknesses stay open, and older systems often lack the logging needed to notice misuse.
Hiring difficulty
Fewer engineers want to work on older stacks, and those who can are harder to find. Knowledge ends up with a small number of people.
Legacy Stacks We Modernise
Mainframe and COBOL
Batch jobs and transaction programs that hold core business rules. We document the rules before any code is moved.
Classic ASP and .NET Framework
Web applications tied to older Windows servers. Typical targets are current .NET versions and container or cloud hosting.
Java EE
Applications on older application servers with heavy XML configuration. We move them to current Java versions and lighter runtimes.
PHP 5 era applications
Code written for PHP versions that are no longer supported, often without a framework or tests. We add tests first, then upgrade.
Desktop client-server applications
Thick clients that talk directly to a database. We move business logic behind an API so that new clients can be built safely.
Stored-procedure-heavy databases
Systems where most of the logic lives in the database. We map the procedures, test them, and move logic out in stages.
If your stack is not listed, tell us what you run. The method is the same.
The Five-Step Framework
Each step ends with something you can inspect before the next one starts.
- 1Step 1
Observe
We add logging and monitoring to the current system and record how it behaves in real use, including the parts nobody documented.
- 2Step 2
Isolate
We pick one bounded part of the system and place an interface around it, so it can change without touching the rest.
- 3Step 3
Extract
We build the replacement for that part behind the interface. The old code stays in place and in service.
- 4Step 4
Validate
We run old and new side by side and compare results. Traffic moves to the new part gradually, with a way back at each stage.
- 5Step 5
Retire
Once the new part has carried real load without differences, the old code is removed. Then the cycle repeats for the next part.
Not Sure Where The Risk Sits?
Take the short legacy risk assessment and see which areas need attention first.
The Resilience Audit
A structured review of one legacy system. It tells you where the risk is and what to do first.
What we analyse
- Support status of each component
- Architecture and dependencies
- Test coverage and deployment process
- Who holds the knowledge today
What you receive
- A written list of risks in order of importance
- A proposed sequence for modernisation
- The team shape needed to carry it out
What happens next
- An NDA is signed before any code access
- A call with a senior engineer to agree scope
- We review the system and present the findings to you
Why CTOs Choose This Approach
Every step can be undone
The old component stays available until its replacement is proven. If something looks wrong, traffic goes back.
Evidence before change
Decisions are based on how the system behaves in production, not on what the documentation says it should do.
Small scope per step
One bounded part changes at a time. A problem affects that part only, and is easier to find.
You keep ownership
The work happens in your repository. You own all code and IP, and terms run month to month.
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Frequently Asked Questions
No. We advise against it. The framework replaces one bounded part at a time while the rest of the system keeps running.
It depends on the size of the system, the quality of existing tests and how many parts need to move. The audit gives you a proposed sequence, and the first step is scoped before work starts.
That is common. The Observe step records how the system behaves in real use, and we write tests that capture that behaviour before changing anything.
Yes. Your engineers know the business rules. We work alongside them in your repository and tools, and knowledge is shared as the work proceeds.
This service covers platforms and core systems, including infrastructure, databases and runtime. Application modernisation focuses on the code and structure of individual applications.
Start With One System
Request a resilience audit. You will get a written view of the risks and a proposed order of work.